World'S Best Onion Sandwich
A flavorful onion sandwich featuring marinated sweet onions, toasted bread, and optional tomato, perfect for a savory snack or light lunch with tangy and sweet notes.
Ingredients
Instructions
- Mix vinegar, mustard, salt, A.1. sauce, and sugar to create the marinade.
- Slice sweet onions and marinate them in the mixture for 3 to 4 hours.
- Increase the amount of marinade proportionally as you add more onions.
- Butter both sides of the bread slices.
- Make a sandwich with the marinated sliced onions between the buttered bread slices.
- Toast the sandwich on a grill until golden brown.
- Optionally, add sliced tomato inside the sandwich before toasting.
Tips & Substitutions
For a richer flavor, consider adding a dash of your favorite hot sauce to the marinade. If sweet onions are unavailable, yellow onions can be used, but add a bit more sugar to balance their sharpness. Toasting the sandwich in a pan instead of a grill can yield a crispier texture. Pair with Sylvia's Jezebel Sauce for a zesty contrast.
Serving Suggestions
Serve the onion sandwich with a side of crunchy pickles or a simple green salad for a refreshing contrast. It pairs beautifully with Lemon Sandwich Spread for extra flavor. For a heartier meal, consider serving it alongside a cup of tomato soup or a light pasta salad.
Storage & Reheating
Leftover marinated onions can be stored in an airtight container in the refrigerator for up to a week. The assembled sandwich is best eaten fresh, but if you have leftovers, store them ungrilled in the fridge. Reheat on a skillet over low heat, pressing down gently to crisp the bread.
Nutrition & Diet Analysis (per serving)
Each serving of World'S Best Onion Sandwich contains roughly 61 calories, with 1g protein, 11g carbohydrates, and 0g fat. Note that it is relatively high in sodium, at 534mg per serving (23% of the Daily Value).
Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.
* % Daily Values based on a 2,000 calorie diet (FDA 2020).
Frequently Asked Questions
Can I use different types of onions?
Yes, while sweet onions like Vidalia are recommended for their mild flavor, yellow onions can work as a substitute. However, they will impart a sharper taste, so consider adjusting the sugar in the marinade to balance it.
How can I make this sandwich vegan?
To make a vegan version, simply use plant-based butter on the bread and ensure your mustard and A.1. sauce are vegan-friendly. The marinated onions will still provide a deliciously tangy flavor without any animal products.
Can I prepare this sandwich in advance?
Yes, you can marinate the onions a day ahead and store them in the fridge. However, it's best to assemble and toast the sandwich just before serving to enjoy the perfect texture and flavor.
Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).